. Author manuscript; available in PMC: 2011 May 1.

Published in final edited form as: Magn Reson Imaging. 2010 Feb 1;28(4):466–476. doi: 10.1016/j.mri.2009.12.007

Table 1.

Mean motion in all directions and the maximal displacement (D) during the four functional tasks in the younger and older subject groups. Data shown are mean±SD of 12 subjects in each group.

subjects	task	motion
subjects	task	roll (deg)	pitch (deg)	yaw (deg)	dS (mm)	dL (mm)	dP (mm)	D (mm)
young	rest	0.05±0.05	0.18±0.14	0.06±0.05	0.07±0.08	0.03±0.02	0.23±0.22	1.19±0.43^*
	motor	0.05±0.05	0.13±0.13	0.05±0.04	0.07±0.07	0.03±0.03	0.03±0.03	0.78± 0.36^**
	cognitive	0.06±0.07	0.09±0.10	0.06±0.06	0.11±0.11	0.04±0.04	0.05±0.05	0.75± 0.43^§
	BH	0.04±0.05	0.12±0.12	0.07±0.07	0.09±0.10	0.04±0.04	0.06±0.07	0.78± 0.34^§§
old	rest	0.10±0.08	0.11±0.11	0.10±0.08	0.15±0.12	0.06±0.06	0.30±0.15	1.44± 0.90
	motor	0.09±0.06	0.14±0.12	0.09±0.06	0.17±0.16	0.07±0.06	0.08±0.08	1.21± 0.93
	cognitive	0.13±0.17	0.17±0.13	0.15±0.15	0.19±0.17	0.10±0.13	0.07±0.07	1.37± 0.67
	BH	0.09±0.09	0.11±0.09	0.09±0.07	0.14±0.11	0.07±0.07	0.11±0.08	1.06± 0.39

Not significantly different from older subjects

P<0.20;

^**

P<0.08, student’s t-test

Significantly different from older subjects

^§

P<0.04;

^§§

P<0.01, student’s t-test